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这篇文章主要介绍了HDFS如何实现读写操作,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
import java.io.OutputStream;
import java.net.URI;
import java.net.URL;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;
import org.apache.hadoop.fs.Path;
public class HdfsTest {
public static void main(String[] args) throws Exception {
write();
}
public static void read1(String url) throws Exception {
URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());
System.out.println(IOUtils.toString(new URL(url).openStream()));
}
public static void read2(String url) throws Exception {
Configuration conf = new Configuration();
FileSystem fs = FileSystem.get(URI.create(url), conf);
FSDataInputStream is = fs.open(new Path(url));
System.out.println(IOUtils.toString(is));
is.close();
fs.close();
}
public static void write() throws Exception {
String hdfsFile = "hdfs://192.168.202.134:9000/test/text2.txt";
Configuration conf = new Configuration();
FileSystem fs = FileSystem.get(URI.create(hdfsFile), conf, "andy");
OutputStream out = fs.create(new Path(hdfsFile), true);
out.write("new file text2.txt".getBytes());
out.close();
fs.close();
read1(hdfsFile);
read2(hdfsFile);
}
}
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